<!DOCTYPE html>


14.25提交


<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>贪吃蛇</title>
    <style type="text/css">
        /*1212121*/

        /*211212*/
*{margin:0;padding: 0;font-family: "Microsoft YaHei";}
#page{margin-right: auto;margin-left: auto; margin-top: 20px;height: 600px; width: 980px; }
#yard{ width: 800px;border: 1px solid gray;box-shadow: 0 0 10px black; float: right;}
#mark{font-weight: 800;}
#mark_con{ color: red; }
button{width: 50px; }
a{text-decoration:none;}
</style>
<script type="text/javascript">
        //伪常量
        var BLOCK_SIZE = 20;        //格子大小
        var COLS = 40;                        //列数
        var ROWS = 30;                        //行数
        //变量
        var snakes = [];                //保存蛇坐标
        var c = null;                        //绘图对象
        var toGo = 3;                        //行进方向
        var snakecount = 4;                //蛇身数量
        var interval = null;        //计时器
        var foodX = 0;                        //食物X轴坐标
        var foodY = 0;                        //食物Y轴坐标
        var oMark = null;                //分数显示框
        var isPause = false;        //是否暂停
		function shuaxin(){
			location.reload();
		}
        // 绘图函数
        function draw(){
            c.clearRect(0,0,BLOCK_SIZE * COLS, BLOCK_SIZE * ROWS);
            //画出横线
            for( var i = 1; i <= ROWS; i++ ) {
                c.beginPath();
                c.moveTo(0, i * BLOCK_SIZE);
                c.lineTo(BLOCK_SIZE * COLS, i * BLOCK_SIZE);
                c.strokeStyle = "gray";
                c.stroke();
            }
            //画出竖线
            for(var i = 1; i <= COLS; i++){
                c.beginPath();
                c.moveTo(i * BLOCK_SIZE, 0);
                c.lineTo(i * BLOCK_SIZE, BLOCK_SIZE * ROWS);
                c.stroke();
            }
            //画出蛇
            for (var i = 0; i < snakes.length; i++){
                c.beginPath();
                c.fillStyle = "green";
                c.fillRect(snakes[i].x, snakes[i].y, BLOCK_SIZE, BLOCK_SIZE);
                c.moveTo(snakes[i].x, snakes[i].y);
                c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y);
                c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y + BLOCK_SIZE);
                c.lineTo(snakes[i].x, snakes[i].y + BLOCK_SIZE);
                c.closePath();
                c.strokeStyle = "red";
                c.stroke();
            }
            //画出食物
            c.beginPath();
            c.fillStyle = "yellow";
            c.fillRect(foodX, foodY, BLOCK_SIZE, BLOCK_SIZE);
            c.moveTo(foodX, foodY);
            c.lineTo(foodX + BLOCK_SIZE, foodY);
            c.lineTo(foodX + BLOCK_SIZE, foodY + BLOCK_SIZE);
            c.lineTo(foodX, foodY + BLOCK_SIZE);
            c.closePath();
            c.strokeStyle = "red";
            c.stroke();
        }
        //游戏初始化
        function start(){
            for( var i = 0; i < snakecount; i++){
                snakes[i] = {x: i * BLOCK_SIZE, y: 0};
            }
            addFood();
            //draw();
            oMark.innerHTML = 0;
        }
        //移动函数
        function move(){
            switch(toGo){
                case 1: //左边
                    snakes.push({x: snakes[snakecount - 1].x - BLOCK_SIZE, y: snakes[snakecount - 1].y});
                break;
                case 2: //上边
                    snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y - BLOCK_SIZE});
                break;
                case 3: //右边
                    snakes.push({x: snakes[snakecount - 1].x + BLOCK_SIZE, y: snakes[snakecount - 1].y});
                break;
                case 4: //下边
                    snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y + BLOCK_SIZE});
                break;
                default:;
            }
            snakes.shift();
            isEat();
            isDie();
            draw();
        }
        //吃到食物判断
        function isEat(){
            if (snakes[snakecount - 1].x == foodX && snakes[snakecount - 1].y == foodY) {
                oMark.innerHTML = (parseInt(oMark.innerHTML) + 1).toString();
                addFood();
                addSnake();
            }
        }
        //添加蛇身
        function addSnake(){
            snakecount++;
            snakes.unshift({x:BLOCK_SIZE * COLS, y:BLOCK_SIZE * ROWS});
        }
        //交互响应函数
        function keydown(keyCode){
                switch(keyCode){
                        case 37: //左边
                                if(toGo != 1 && toGo != 3)  toGo = 1;break;
                        case 38: //上边
                                if(toGo != 2 && toGo != 4)        toGo = 2;break;
                        case 39: //右边
                                if(toGo != 3 && toGo != 1)         toGo = 3;break;
                        case 40: //下的
                                if(toGo != 4 && toGo != 2)        toGo = 4;break;
                        case 80: //开始/暂停
                                if(isPause){
                                        interval = setInterval(move,200);
                                        isPause = false;
                                        document.getElementById('pause').innerHTML = "Pause";
                                }else{
                                        clearInterval(interval);
                                        isPause = true;
                                        document.getElementById('pause').innerHTML = "Start";
                                }
                                break;
                }
        }
        //制造食物
        function addFood(){
                foodX = Math.floor(Math.random() * (COLS - 1)) * BLOCK_SIZE;
                foodY = Math.floor(Math.random() * (ROWS - 1)) * BLOCK_SIZE;
                // console.log(foodX + " -- " + foodY);
        }
        //死亡判断
        function isDie(){
                if(snakes[snakecount - 1].x == -20 || snakes[snakecount - 1].x == BLOCK_SIZE * COLS
                        || snakes[snakecount - 1].y == -20 || snakes[snakecount - 1].y == BLOCK_SIZE * ROWS){
                        alert("Game Over!");
                        clearInterval(interval);
                }
                for(var i = 0; i < snakecount - 1; i++){
                        if(snakes[snakecount - 1].x == snakes[i].x && snakes[snakecount - 1].y == snakes[i].y){
                                clearInterval(interval);
                                alert("Game Over!");
                        }
                }
        }
        // 启动函数
        window.onload = function(){
            c = document.getElementById('canvas').getContext('2d');
            oMark = document.getElementById('mark_con');
            start();
            interval = setInterval(move,100);
            document.onkeydown = function(event){
                var event = event || window.event;
                keydown(event.keyCode);
            }
        }
</script>
</head>
<body>
<button style="width: 100px;height: 40px;background-color: pink;margin-left: 100px;" onclick="shuaxin()">再来一次</button>
    <div id="page">
        <div id="yard"><canvas id="canvas" height="600px" width="800px"></canvas></div>

        <div id="help">
            <div id="mark">得分：<span id="mark_con"></span></div>
            <!--
            <div id="helper">
                <table>
                    <tr>
                        <td></td>
                        <td><button οnclick="keydown(38);">上</button></td>
                        <td></td>
                    </tr>
                    <tr>
                        <td><button οnclick="keydown(37);">左</button></td>
                        <td><button οnclick="keydown(80);" id="pause">暂停</button></td>
                        <td><button οnclick="keydown(39);">右</button></td>
                    </tr>
                    <tr>
                        <td></td>
                        <td><button οnclick="keydown(40);">下</button></td>
                        <td></td>
                    </tr>
                </table><a href="index.html">再玩一次</a>
            </div>-->
        </div>
    </div>
    <div style="text-align:center;">
</div>
</body>
</html>
